DEX Price Alert for Pair

WHAT IT DOES

DEX Price Alert for Pair monitors the current Uniswap pool pair page for price changes in real time. You set a price threshold and choose whether to alert when the price goes above or below that level. When the price crosses your threshold, the tool triggers an alert — a desktop notification, an audible sound, and a flash message in the panel. It also logs price history with timestamps, so you can see price movements over time. The tool is read-only — it never signs transactions or moves funds, it simply watches the page and notifies you.

WHERE IT RUNS

This userscript runs inside Uniswap (app.uniswap.org) in your browser, powered by the free BotGentz extension. It operates entirely on the page you are viewing — it reads the price from the page DOM and optionally connects to your wallet to read on-chain data as a fallback. All price data is read directly from the page or the chain through your wallet's provider.

HOW TO USE

Install the BotGentz extension, then install this userscript from the BotGentz catalogue. Navigate to any Uniswap pool page. The tool will automatically detect the pair name and current price. Connect your wallet (MetaMask or any EVM-compatible wallet) — this is optional but recommended for more reliable price detection. Configure your settings — set a price threshold, choose the direction (above or below), set the poll interval in seconds, and toggle sound and desktop notifications. Click "Start Monitoring" to begin. The tool will check the price at the configured interval and alert you when your threshold is crossed. Use "Test Alert" to verify your notification settings. Price history is displayed in the panel and persisted locally.

HOW IT WORKS UNDER THE HOOD

The script uses a multi-strategy extraction approach to detect price from the Uniswap page. It first attempts to locate price elements using common selectors like .price-amount, .token-price, and [data-testid="price-amount"]. If those fail, it scans the page for price-like patterns using regex matching. Optionally, if a wallet is connected and the pool address is known, the script can read the current spot price directly from the pool contract via ethers.js, providing a fallback when DOM extraction fails. The tool polls at the configured interval (default 5 seconds) and compares the current price against the threshold. When a crossing is detected, it triggers notifications and logs the alert in the history. All history is stored locally using GM_setValue and persists across sessions.

THE PANEL

The tool runs in the BotGentz panel, a draggable floating interface that stays on top of the page. You can drag the panel by its header, collapse it to a small bubble, and resize it. The panel remembers its position per site, so it stays where you left it when you return to Uniswap. Press Escape to close the panel when you are done. The panel includes a wallet connection button, pair name display, current price display, settings for threshold, direction, poll interval, sound and notification toggles, start/stop monitoring button, test alert button, and price history log.

PLEASE NOTE

This tool requires the free BotGentz extension and a real EVM wallet extension (MetaMask or similar) already installed in your browser for optional on-chain price reads. The tool works on EVM chains only — Uniswap pools on Ethereum, Polygon, Arbitrum, Optimism, and other EVM chains are supported. The tool is read-only and never signs transactions or moves funds. The observed price may not match the final execution price due to slippage and block timing. Price alerts are for informational purposes only — do not rely on them for trading decisions without verification. Uniswap and other DEX platforms frequently update their interfaces — if the tool stops working, check for an updated version or report the issue.